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Note 3 - Basic and Diluted Shares (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
Three Months Ended
 
 
 
March 31,
 
 
 
2017
 
 
2016
 
Basic and diluted
   
18,962,823
     
18,903,466
 
Potentially dilutive
   
27,500
     
22,604